<template>
  <div>
    <!--   面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

<!--    卡片试图区-->
    <el-card>
<!--      提示区域-->
      <el-alert title="添加商品信息" type="info" center :closable="false" show-icon></el-alert>
<!--      步骤条区域-->
<!--      activeIndex-0会将字符串变为数值类型-->
      <el-steps :space="200" :active=activeIndex-0 finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

<!--      tab栏区域-->
      <el-form :model="addForm" :rules="addFormRules"
               ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" tab-position="left"
                 :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_number">
              <el-cascader
                v-model="addForm.goods_cat"
                expandTrigger='hover'
                :options="cateList"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--            渲染表单的item项-->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb,index) in item.attr_vals" :key="index"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
<!--            action表示图片要上传的后台api地址,为headers手动指定请求头同时为Authorization绑定token-->
            <el-upload
              action="http://localhost:8081/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              :headers="headerObj"
              list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
<!--            富文本编辑器组件-->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
<!--            添加商品的按钮-->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
<!--图片预览-->
    <el-dialog
      title="图片预览" :visible.sync="imgDialogVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>

  </div>
</template>

<script>
import _ from 'lodash'
export default {
  name: "Add",
  created() {
    this.getCateList()
  },
  computed:{
    cateId(){
      if (this.addForm.goods_cat.length===3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  methods:{
    //添加商品
    add(){
      this.$refs.addFormRef.validate(valid=>{
        if (!valid){
          return this.$message.error('请填写必要的表单项！')
        }
      //  执行添加的业务逻辑
        const form=_.cloneDeep(this.addForm)
        form.goods_cat=form.goods_cat.join(',')
      //  处理动态参数
        this.manyTableData.forEach(item=>{
          const newInfo={
            attr_id:item.attr_id,
            attr_value:item.attr_vals.join(',')
          }
          this.addForm.attrs.push(newInfo)
        })
      //  处理静态属性，此处不需要join因为静态属性的value值本身就是字符串
        this.onlyTableData.forEach(item=>{
          const newInfo={
            attr_id:item.attr_id,
            attr_value:item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs= this.addForm.attrs
      //  发起请求添加商品
      //  商品的名称必须是唯一的
        this.$http.post('goods',form).then(({data:res})=>{
          if (res.meta.status!==201) return this.$message.error('添加商品失败！')
          this.$message.success('添加商品成功！')
          this.$router.push('/goods')
        })
      })
    },
    //监听图片上传成功的事件
    handleSuccess(response){
    //  1.拼接得到1个图片信息对象
      const picInfo={pic:response.data.tmp_path}
    //  2.将图片信息对象push到pics数组
      this.addForm.pics.push(picInfo)
    },
    //处理移除图片的操作
    handleRemove(file){
// 1.获取将要删除的图片的临时路径
      const filePath=file.response.data.tmp_path
// 2.从pics数组中，找到这个图片对应的索引值,x指pics数组中的每一项
      const i=this.addForm.pics.findIndex(x=> x.pic===filePath)
// 3.调用数组的splice 方法，把图片信息对象， 从pics 数组中移除
      this.addForm.pics.splice(i,1)
    },
    //处理图片预览效果
    handlePreview(file){
      this.previewPath=file.url
      this.imgDialogVisible=true
    },
    tabClicked(){
      //证明访问的是商品参数面板
      if (this.activeIndex==='1'){
        this.$http.get(`categories/${this.cateId}/attributes`, {
          params:{
            sel:'many'
          }}).then(({data:res})=>{
          if (res.meta.status!==200) return this.$message.error('获取动态参数列表失败！')
          res.data.forEach(item=>{
            item.attr_vals=item.attr_vals.length===0?[]:item.attr_vals.split(',')
          })
          this.manyTableData=res.data
        })
      }else if (this.activeIndex==='2'){
        this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{
            sel:'only'
          }}).then(({data:res})=>{
          if (res.meta.status!==200) return this.$message.error('获取静态属性失败！')
          this.onlyTableData=res.data
        })
      }
    },
    beforeTabLeave(activeName,oldActiveName){
      if (oldActiveName==='0'&&this.addForm.goods_cat.length!==3){
        this.$message.error('请先选择商品分类！')
        return false
      }

    },
    //级联选择器选中项变化会触发函数
    handleChange(){
      if (this.addForm.goods_cat.length!==3) this.addForm.goods_cat=[]
    },
    getCateList(){
       this.$http.get('categories').then(({data:res})=>{
         if (res.meta.status!==200) return this.$message.error('获取商品分类数据失败')
         this.cateList=res.data
       })
    }
  },
  data(){
    return{

      imgDialogVisible:false,
      previewPath:'',
      //图片上传组件的headers请求头对象
      headerObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      //静态属性列表数据
      onlyTableData:[],
      //动态参数列表数据
      manyTableData:[],
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      //商品分类列表
      cateList:[

      ],
      activeIndex:'0',
      //添加商品的表单数据对象
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        goods_cat:[],
        //图片数组
        pics:[],
        goods_introduce:'',
        attrs:[]
      },
      addFormRules:{
        goods_name:[
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat:[
          { required: true, message: '请输入商品分类', trigger: 'blur' }
        ]
      }
    }
  }
}
</script>

<style scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>
